[PATCH 4/4] cxl: Adjust offset calculation for poison injection

[Dave Jiang <dave.jiang@intel.com>]

The HPA to DPA translation for poison injection assumes that the
base address starts from where the CXL region begins. When the
extended linear cache is active, the offset can be within the DRAM
region. Adjust the offset so that it correctly reflects the offset
within the CXL region.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
---
 drivers/cxl/core/region.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index 095f5dcd17a1..eaf085aa44c4 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -3731,6 +3731,7 @@ static int cxl_region_debugfs_poison_inject(void *data, u64 offset)
 	if (validate_region_offset(cxlr, offset))
 		return -EINVAL;
 
+	offset -= cxlr->params.cache_size;
 	rc = region_offset_to_dpa_result(cxlr, offset, &result);
 	if (rc || !result.cxlmd || result.dpa == ULLONG_MAX) {
 		dev_dbg(&cxlr->dev,
@@ -3763,6 +3764,7 @@ static int cxl_region_debugfs_poison_clear(void *data, u64 offset)
 	if (validate_region_offset(cxlr, offset))
 		return -EINVAL;
 
+	offset -= cxlr->params.cache_size;
 	rc = region_offset_to_dpa_result(cxlr, offset, &result);
 	if (rc || !result.cxlmd || result.dpa == ULLONG_MAX) {
 		dev_dbg(&cxlr->dev,
-- 
2.51.0